Sorry - i don't wish to offend but why is this phase so often like pulling teeth? Now we know that your application is "high current" and "low voltage", and that square waves are involved. The only answer this info is going to get you is, that there are 100 000+ components fulfilling your request. Just close your eyes and pick one from the hat.
In case this answer is not satisfactory, please do give more info. For starters, what is "low" voltage and "high" current for you in this context? Square wave to what purpose? In isolation that is meaningless - _all_ switching applications are controlled by a square wave of some kind. The switching frequency and nature of switched load would help enormously.
So, please. What is your application and what is your design so far. Knowing that we might be able to help but you have to lift the veil of secrecy to let us do that.